While it would be understandable for an author to not assume the reader has any familiarity with the subject matter when writing an educational book, Prunckun goes several steps too far and doesn't trust the reader to have even a sliver of intelligence.
What you'll find in this book are several paragraphs explaining the purpose of doors, walls, locks, etc.
There's only surface level investigations on potential weakness points and the author seems more concern in trying to make "impactfull" chapter titles like "The Five Pillars of Physical Security" (basically locks), "The Three Tenets of This" or "The Seven Cores of that", etc.
Not to mention the excessive use of "tactical" speech for even the most banal things, you'll get stuff like "the individual must ascertain complete field awareness before motioning one foot in front of the other in order to traverse the designated space"
Don't waste your time on this